The emergence of an aerobic world: isotopic evidence for biogeochemical changes at the Archean-Proterozoic transition

有氧世界的出现：太古代-元古代过渡时期生物地球化学变化的同位素证据

• 批准号: 37334373
• 负责人: Professor Dr. Harald Strauß
• 金额: --
• 依托单位: Institut für Geologie und Paläontologie
• 依托单位国家: 德国
• 项目类别: Infrastructure Priority Programmes
• 财政年份: 2007
• 资助国家: 德国
• 起止时间: 2006-12-31 至 2011-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/37334373?language=en
• 关键词: emergence; aerobic; world; isotopic; evidence

Undoubtedly, the late Neoarchean and early Paleoproterozoic is a time window in Earth history, where our planet experienced a most extraordinary environmental change: the first major rise in atmospheric oxygen, likely changing existing biochemistries from anaerobic to aerobic. This point in time, termed the Great Oxidation Event, marks the onset of aerobic conditions in environments located at the Earth’s surface. Anaerobic processes vanished from the surface waters into still anoxic deep waters and/or into the sediment. Consequently, oceanic biochemistry progressively resembled that of the modern aerobic world, particular with respect to the recycling of organic matter. The rise in atmospheric oxygen was paralleled by an increase in oceanic sulphate abundance as a consequence of oxidative weathering on the continents. An increasing level of oceanic sulphate, in turn, must have stimulated its microbial turnover via sulphate reduction, with other forms of microbial sulphur cycling that likely followed. A detailed sulphur isotope record for this time interval will document this increasing importance of sulphur metabolism under changing environmental conditions.

毫无疑问，新太古代晚期和古元古代早期是地球历史上的一个时间窗口，我们的星球经历了一次最不寻常的环境变化：大气中的氧气第一次大幅上升，可能将现有的生物化学从无氧转变为有氧，这个时间点被称为“有氧”。大氧化事件，标志着地球表面环境中有氧条件的开始，厌氧过程从地表水域消失，进入仍然缺氧的深层水域。经过检查，海洋生物化学逐渐与现代有氧世界相似，特别是在有机物的循环方面。大气中氧气的增加与氧化风化导致的海洋硫酸盐丰度的增加同时发生。海洋硫酸盐含量的增加必然通过硫酸盐还原刺激了微生物的周转，随之而来的是其他形式的微生物硫循环。该时间间隔的硫同位素记录将记录硫代谢在不断变化的环境条件下日益增加的重要性。

项目成果

Isotopic evidence for a sizeable seawater sulfate reservoir at 2.1 Ga

• DOI: 10.1016/j.precamres.2011.10.013
• 发表时间: 2012
• 期刊: Precambrian Research
• 影响因子: 3.8
• 作者: M. Reuschel;V. Melezhik;M. Whitehouse;A. Lepland;A. Fallick;H. Strauss